Degradation behavior of Ni{sub 3}Al plasma-sprayed boiler tube steels in an energy generation system

Boiler steels, namely, low-C steel, ASTM-SA210-Grade A1 (GrA1), 1Cr-0.5Mo steel, ASTM-SA213-T-11 (T11) and 2.25Cr-1Mo steel, ASTM-SA213-T-22 (T22) were plasma sprayed with Ni3Al. The alloy powder was prepared by mixing Ni and Al in the stoichiometric ratio of 3 to 1. The Ni-22Cr-10Al-1Y alloy powder...

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Bibliographic Details
Published in:Journal of materials engineering and performance 2005-06, Vol.14 (3)
Main Authors: Sidhu, B.S., Prakash, S.
Format: Article
Language:English
Subjects:
20 FOSSIL-FUELED POWER PLANTS
BOILERS
CHROMIUM STEELS
COAL
COATINGS
CORROSION
CORROSION RESISTANCE
EROSION
FOSSIL-FUEL POWER PLANTS
MATERIALS SCIENCE
NICKEL OXIDES
SCALING
SPRAY COATING
STEELS
TUBES
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Summary:Boiler steels, namely, low-C steel, ASTM-SA210-Grade A1 (GrA1), 1Cr-0.5Mo steel, ASTM-SA213-T-11 (T11) and 2.25Cr-1Mo steel, ASTM-SA213-T-22 (T22) were plasma sprayed with Ni3Al. The alloy powder was prepared by mixing Ni and Al in the stoichiometric ratio of 3 to 1. The Ni-22Cr-10Al-1Y alloy powder was used as a bond coat, with a 150{mu} m thick layer sprayed onto the surface before applying the 200{mu}m coating of Ni{sub 3}Al. Exposure studies have been performed in the platen superheater zone of a coal-fired boiler at around 755{sup o}C for 10 cycles, each of 100 h duration. The protection to the base steel was minimal for the three steels. Scale spallation and the formation of a porous and nonadherent NiO scale were probably the main reasons for the lack of protection. In the case of T22-coated steel, cracks in the coatings have been observed after the first 100 h exposure cycle.
ISSN:1059-9495
1544-1024
DOI:10.1361/10599490523382